Integrated Buck-Boost Power Circuit With Shared Choke and Capacitor
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Solution Overview
Problem
Power supply apparatuses with inrush current prevention circuits and boost converter circuits face high costs due to the number of circuit elements required.
Innovation Solution
A power supply apparatus that integrates an inrush current prevention circuit based on a buck converter system and a boost converter circuit, sharing a common choke coil and smoothing capacitor, with a mode control circuit to switch between inrush current prevention and boost converter operations, reducing the number of components needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inrush current prevention circuit and a boost converter circuit are provided separately, then inrush current suppression and DC voltage output are ensured, but the cost of circuit elements increases
Solution Approach 1:
The patent combines the inrush current prevention circuit and boost converter circuit into a single integrated circuit. The choke coil L1 and smoothing capacitor C1 are shared between both circuits, eliminating the need for separate components. This merging reduces the total number of circuit elements and lowers cost while maintaining both inrush current suppression and DC voltage output functions.
Solution Approach 2:
The integrated circuit performs multiple functions: it acts as an inrush current prevention circuit during startup and as a boost converter circuit during normal operation. The same choke coil and smoothing capacitor serve both the inrush current prevention function and the DC voltage output function, achieving multi-functionality with fewer components.
2Reliability
If separate choke coils and smoothing capacitors are used for inrush current prevention and boost converter circuits, then circuit performance is optimized, but the number of components increases
Solution Approach 1:
The patent merges the choke coil and smoothing capacitor into a single shared component set for both circuits. The first choke coil L1 serves as the inrush current prevention choke coil, and the first smoothing capacitor C1 serves as the inrush current prevention smoothing capacitor, while simultaneously functioning as the boost converter choke coil and smoothing capacitor. This reduces the component count while maintaining performance.
Solution Approach 2:
The choke coil L1 and smoothing capacitor C1 are designed to perform dual functions: preventing inrush current during startup and enabling DC voltage boosting during normal operation. This multi-functionality allows the circuit to achieve optimized performance with fewer components.
3Adaptability or versatility
If a mode control circuit is added to switch between operation modes, then circuit versatility is improved, but device complexity increases
Solution Approach 1:
The circuit dynamically switches between two operation modes based on real-time conditions. The mode control circuit monitors the voltage across the first FET Q1 and automatically transitions between inrush current prevention mode and boost converter mode, enabling the circuit to adapt to different operational requirements without manual intervention.
Solution Approach 2:
The mode control circuit uses feedback from the voltage detector to determine when to switch between operation modes. By monitoring the voltage across the first FET Q1, the control circuit receives feedback about the circuit's operational state and adjusts the mode accordingly, achieving versatile operation with a relatively simple control mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the cost of circuit elements while maintaining effective inrush current suppression and DC voltage output, allowing the apparatus to operate efficiently in either mode.
Implementation Method 1
a boost converter circuit configured to output the predetermined direct current voltage
Implementation Method 2
a smoothing capacitor included in the inrush current prevention circuit and a smoothing capacitor included in the boost converter circuit are a common smoothing capacitor
Data Source
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AI summary
A power supply apparatus (100) according to the present disclosure converts an input voltage supplied from a power source to a predetermined direct current voltage. The power supply apparatus (100) includes an inrush current prevention circuit (120) based on a buck converter system and configured to suppress a flow of inrush current from the power source to the power supply apparatus (100) and a boost converter circuit (130) configured to output the predetermined direct current voltage. A choke coil (104) included in the inrush current prevention circuit (120) and a choke coil (104) included in the boost converter circuit (130) are a common choke coil. A smoothing capacitor (107) included in the inrush current prevention circuit (120) and a smoothing capacitor (107) included in the boost converter circuit (130) are a common smoothing capacitor.